Slow feather regrowing

[georgiapumpkin]

I've got 13 hens and I had one rooster. He was a little vigorous with 10 of those hens and a lot vigorous with at least 4. I finally removed him almost 3 months ago and recently found him a new home. One hen's feathers still hasn't grown back and she was the worst. There are a few others who have a little bald spot on there backs still. Is it normal to take so long for the feathers to grow back or is there something I need to do to help them out? There a year old now and I give them a mixture of pellets and chick starter. Someone had said giving them some chick starter mixed in will help with the feathers and also the eggs.
Thanks

 

[sourland]

They may not completely regrow feathers until they molt this fall.

 

[georgiapumpkin]

They may not completely regrow feathers until they molt this fall.

Ok, thanks
I guess I was wondering if they were going to do that also anytime soon.